(SEC_LINK_DUPLICATES): Define.
(SEC_LINK_DUPLICATES_DISCARD): Define.
(SEC_LINK_DUPLICATES_ONE_ONLY): Define.
(SEC_LINK_DUPLICATES_SAME_SIZE): Define.
(SEC_LINK_DUPLICATES_SAME_CONTENTS): Define.
* bfd-in2.h: Rebuild.
* coffcode.h (sec_to_styp_flags): If COFF_WITH_PE, turn
SEC_LINK_ONCE into IMAGE_SCN_LNK_COMDAT.
(styp_to_sec_flags): If COFF_WITH_PE, turn IMAGE_SCN_LNK_REMOVE
into SEC_EXCLUDE. If IMAGE_SCN_LNK_COMDAT is set, set
SEC_LINK_ONCE, and look through the symbol table for the setting
for SEC_LINK_DUPLICATES.
(coff_write_object_contents): If COFF_WITH_PE, if SEC_LINK_ONCE is
set for a section, find the section symbol in the symbol table,
and set the aux entry based on SEC_LINK_DUPLICATES.
* coffgen.c (coff_print_symbol): Add a space before "checksum".
* coff-arm.c (armcoff_big_vec): If COFF_WITH_PE is defined, add
SEC_LINK_ONCE and SEC_LINK_DUPLICATES to section_flags.
* coff-i386.c (i386coff_vec): Likewise.
* coff-ppc.c (TARGET_LITTLE_SYM, TARGET_BIG_SYM): Likewise.
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